replace WeiboListFragment layout to list_content, loadMore and refresh
works

replace WeiboListFragment layout to list_content.xml from android source (Android API level 18 file with the same name) with minor fix to get default behavior of ListFragment on android.support.v4.app.ListFragment.

move OptionsMenu creation from Activity to WeiboListFragment, and call
setHasOptionsMenu(true); in  WeiboListFragment::onCreate().

refreshWeibo and loadMoreWeibo works now.